While up north, I got stuck in some lose sand on a fire lane. I put the truck into 4WD high and attempted to get out of the sand. When I hit the gas, the only tires that were spinning were my rear tires. I then tried 4WD low and had enough "power" to get out, I do not know if the front wheels were engaging in 4 low. When I got back to my cabin, I engaged 4WD again (indicator light is on) and put the truck into park (to my understanding if 4WD is working correctly, I should not be able to move the tires). I tried spinning the front tires and they turned with each other so the actuator is engaging the 4WD but they were not limited by the truck being in park. here